gettimeofday() issues

Get time of day returns the NUMBER of microseconds, not the digits of microseconds (6 of them) past the decimal. So to make it work with BC math, the microseconds needed to be sprintf'd in order to normalize them to 6 digits right justified. Here is the new code for both functions. Now tested for seconds rollover and 32/64bit platforms:

function make_comb_uuid(){
uuid_create(&$v4);
uuid_make($v4, UUID_MAKE_V4);
uuid_export($v4, UUID_FMT_STR, &$v4String);
$var=gettimeofday(FALSE);
return substr($v4String,0,24).substr(bcdechex($var['sec'].
 sprintf("%06d", $var['usec'])),0,12);
}

function bcdechex($dec) {
if(PHP_INT_SIZE > 16){
return dechex($dec);
} else {
$last = bcmod($dec, 16);
$remain = bcdiv(bcsub($dec, $last), 16);

if($remain == 0) {
 return dechex($last);
 } else {
   return bcdechex($remain).dechex($last);
 }
}
}